/*
* Written by Doug Lea and Martin Buchholz with assistance from members
* of JCP JSR-166 Expert Group and released to the public domain, as
* explained at http://creativecommons.org/publicdomain/zero/1.0/
*
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
package jsr166;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Queue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Contains "contract" tests applicable to all BlockingQueue implementations.
*/
public abstract class BlockingQueueTest extends JSR166TestCase {
/*
* This is the start of an attempt to refactor the tests for the
* various related implementations of related interfaces without
* too much duplicated code. junit does not really support such
* testing. Here subclasses of TestCase not only contain tests,
* but also configuration information that describes the
* implementation class, most importantly how to instantiate
* instances.
*/
/** Like suite(), but non-static */
// android-note: Explicitly instantiated.
//
// public Test testSuite() {
// // TODO: filter the returned tests using the configuration
// // information provided by the subclass via protected methods.
// return new TestSuite(this.getClass());
// }
//----------------------------------------------------------------
// Configuration methods
//----------------------------------------------------------------
/** Returns an empty instance of the implementation class. */
protected abstract BlockingQueue emptyCollection();
/**
* Returns an element suitable for insertion in the collection.
* Override for collections with unusual element types.
*/
protected Object makeElement(int i) {
return Integer.valueOf(i);
}
//----------------------------------------------------------------
// Tests
//----------------------------------------------------------------
/**
* offer(null) throws NullPointerException
*/
public void testOfferNull() {
final Queue q = emptyCollection();
try {
q.offer(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* add(null) throws NullPointerException
*/
public void testAddNull() {
final Collection q = emptyCollection();
try {
q.add(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* timed offer(null) throws NullPointerException
*/
public void testTimedOfferNull() throws InterruptedException {
final BlockingQueue q = emptyCollection();
long startTime = System.nanoTime();
try {
q.offer(null, LONG_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (NullPointerException success) {}
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
}
/**
* put(null) throws NullPointerException
*/
public void testPutNull() throws InterruptedException {
final BlockingQueue q = emptyCollection();
try {
q.put(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* put(null) throws NullPointerException
*/
public void testAddAllNull() throws InterruptedException {
final Collection q = emptyCollection();
try {
q.addAll(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* addAll of a collection with null elements throws NullPointerException
*/
public void testAddAllNullElements() {
final Collection q = emptyCollection();
final Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
try {
q.addAll(elements);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* toArray(null) throws NullPointerException
*/
public void testToArray_NullArray() {
final Collection q = emptyCollection();
try {
q.toArray(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* drainTo(null) throws NullPointerException
*/
public void testDrainToNull() {
final BlockingQueue q = emptyCollection();
try {
q.drainTo(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* drainTo(this) throws IllegalArgumentException
*/
public void testDrainToSelf() {
final BlockingQueue q = emptyCollection();
try {
q.drainTo(q);
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* drainTo(null, n) throws NullPointerException
*/
public void testDrainToNullN() {
final BlockingQueue q = emptyCollection();
try {
q.drainTo(null, 0);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* drainTo(this, n) throws IllegalArgumentException
*/
public void testDrainToSelfN() {
final BlockingQueue q = emptyCollection();
try {
q.drainTo(q, 0);
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* drainTo(c, n) returns 0 and does nothing when n <= 0
*/
public void testDrainToNonPositiveMaxElements() {
final BlockingQueue q = emptyCollection();
final int[] ns = { 0, -1, -42, Integer.MIN_VALUE };
for (int n : ns)
assertEquals(0, q.drainTo(new ArrayList(), n));
if (q.remainingCapacity() > 0) {
// Not SynchronousQueue, that is
Object one = makeElement(1);
q.add(one);
ArrayList c = new ArrayList();
for (int n : ns)
assertEquals(0, q.drainTo(new ArrayList(), n));
assertEquals(1, q.size());
assertSame(one, q.poll());
assertTrue(c.isEmpty());
}
}
/**
* timed poll before a delayed offer times out; after offer succeeds;
* on interruption throws
*/
public void testTimedPollWithOffer() throws InterruptedException {
final BlockingQueue q = emptyCollection();
final CheckedBarrier barrier = new CheckedBarrier(2);
final Object zero = makeElement(0);
Thread t = newStartedThread(new CheckedRunnable() {
public void realRun() throws InterruptedException {
long startTime = System.nanoTime();
assertNull(q.poll(timeoutMillis(), MILLISECONDS));
assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
barrier.await();
assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
Thread.currentThread().interrupt();
try {
q.poll(LONG_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (InterruptedException success) {}
assertFalse(Thread.interrupted());
barrier.await();
try {
q.poll(LONG_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (InterruptedException success) {}
assertFalse(Thread.interrupted());
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
}});
barrier.await();
long startTime = System.nanoTime();
assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
barrier.await();
assertThreadStaysAlive(t);
t.interrupt();
awaitTermination(t);
}
/**
* take() blocks interruptibly when empty
*/
public void testTakeFromEmptyBlocksInterruptibly() {
final BlockingQueue q = emptyCollection();
final CountDownLatch threadStarted = new CountDownLatch(1);
Thread t = newStartedThread(new CheckedRunnable() {
public void realRun() {
threadStarted.countDown();
try {
q.take();
shouldThrow();
} catch (InterruptedException success) {}
assertFalse(Thread.interrupted());
}});
await(threadStarted);
assertThreadStaysAlive(t);
t.interrupt();
awaitTermination(t);
}
/**
* take() throws InterruptedException immediately if interrupted
* before waiting
*/
public void testTakeFromEmptyAfterInterrupt() {
final BlockingQueue q = emptyCollection();
Thread t = newStartedThread(new CheckedRunnable() {
public void realRun() {
Thread.currentThread().interrupt();
try {
q.take();
shouldThrow();
} catch (InterruptedException success) {}
assertFalse(Thread.interrupted());
}});
awaitTermination(t);
}
/**
* timed poll() blocks interruptibly when empty
*/
public void testTimedPollFromEmptyBlocksInterruptibly() {
final BlockingQueue q = emptyCollection();
final CountDownLatch threadStarted = new CountDownLatch(1);
Thread t = newStartedThread(new CheckedRunnable() {
public void realRun() {
threadStarted.countDown();
try {
q.poll(2 * LONG_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (InterruptedException success) {}
assertFalse(Thread.interrupted());
}});
await(threadStarted);
assertThreadStaysAlive(t);
t.interrupt();
awaitTermination(t);
}
/**
* timed poll() throws InterruptedException immediately if
* interrupted before waiting
*/
public void testTimedPollFromEmptyAfterInterrupt() {
final BlockingQueue q = emptyCollection();
Thread t = newStartedThread(new CheckedRunnable() {
public void realRun() {
Thread.currentThread().interrupt();
try {
q.poll(2 * LONG_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (InterruptedException success) {}
assertFalse(Thread.interrupted());
}});
awaitTermination(t);
}
/**
* remove(x) removes x and returns true if present
* TODO: move to superclass CollectionTest.java
*/
public void testRemoveElement() {
final BlockingQueue q = emptyCollection();
final int size = Math.min(q.remainingCapacity(), SIZE);
final Object[] elts = new Object[size];
assertFalse(q.contains(makeElement(99)));
assertFalse(q.remove(makeElement(99)));
checkEmpty(q);
for (int i = 0; i < size; i++)
q.add(elts[i] = makeElement(i));
for (int i = 1; i < size; i += 2) {
for (int pass = 0; pass < 2; pass++) {
assertEquals((pass == 0), q.contains(elts[i]));
assertEquals((pass == 0), q.remove(elts[i]));
assertFalse(q.contains(elts[i]));
assertTrue(q.contains(elts[i - 1]));
if (i < size - 1)
assertTrue(q.contains(elts[i + 1]));
}
}
if (size > 0)
assertTrue(q.contains(elts[0]));
for (int i = size - 2; i >= 0; i -= 2) {
assertTrue(q.contains(elts[i]));
assertFalse(q.contains(elts[i + 1]));
assertTrue(q.remove(elts[i]));
assertFalse(q.contains(elts[i]));
assertFalse(q.remove(elts[i + 1]));
assertFalse(q.contains(elts[i + 1]));
}
checkEmpty(q);
}
/** For debugging. */
public void XXXXtestFails() {
fail(emptyCollection().getClass().toString());
}
}